Experimental Study on Accumulated Deformation of Coarse Grained Soli Fill under High-speed Train Load

被引：0

作者：

Wang Q. ^{[1
,2
]}

Wei X. ^{[1
]}

Zhang B. ^{[1
,2
]}

Lin H. ^{[1
]}

Xiao N. ^{[1
]}

Luo C. ^{[1
,2
]}

机构：

[1] School of Civil Engineering, Fujian University of Technology, Fuzhou

[2] Key Laboratory of Underground Engineering of Universities in Fujian, Fujian University of Technology, Fuzhou

来源：

Tiedao Xuebao/Journal of the China Railway Society | 2021年 / 43卷 / 03期

关键词：

Accumulated strain; Coarse-grain soil filling; High-speed train load; Model test; Rainfall infiltration;

D O I：

10.3969/j.issn.1001-8360.2021.03.019

中图分类号：

学科分类号：

摘要：

In order to investigate the dynamic cumulative deformation characteristics of coarse-grained soil subgrade filling under the long-term repeated loads of high-speed train, a unit model test system of coarse-grained soil fillings was constructed in the lab. The dynamic train loads at different train speeds and axle load was simulated by MTS. After 50 000 cycles of loading tests, the relationship curves between dynamic cumulative strain and loading times of coarse-grained soil fillings were obtained, and the effects of the factors, such as frequency, dynamic stress amplitude, rainfall intensity, acting on cumulative strain were analyzed. The results show that the dynamic cumulative strain of the fillings is between 0.3% to 1% under the load of dynamic stress amplitude of 25-200 kPa and loading frequency of 2-8 Hz. The dynamic cumulative strain is approximately linear with the increase of dynamic stress amplitude and frequency. When the loading frequency is beyond 6 Hz, the cumulative strain increase rate increases remarkably. The dynamic cumulative strain of coarse-grained soil fillings is more than doubled due to rainfall infiltration. With the increase of rainfall infiltration, the cumulative strain shows a trend of sharp increase first followed by a slow increase. Finally, a prediction model of exponential hyperbolic function for dynamic cumulative strain of coarse-grained soil filling and loading times was proposed in consideration of dynamic stress amplitude, frequency, rainfall infiltration intensity. The functional relationships between the model parameters and frequency, dynamic stress amplitude and rainfall infiltration were established and verified by experimental data. The research results provide references for the prediction and control of post construction settlement of the coarse-grained soil subgrade of high-speed railway. © 2021, Department of Journal of the China Railway Society. All right reserved.

引用

页码：149 / 157

页数：8

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